U.S.S. Gauge

A gauge system used for carbon steels but not appropriate for stainless steels where thickness is specified in decimals. However, salesperson should always question customer when unsure as to whether U.S.S. or decimal is being specified. For example, 16 gauge for U.S.S. is .058″ not .016″. U.S.S. does not stand for Ulbrich Stainless Steel.

Ultimate Tensile Strength

The maximum stress in pounds per square inch (psi) that causes the material to fracture.

Universal Mill

A rolling mill in which rolls with a vertical axis roll the edges of the metal stock between some of the passes through the horizontal rolls.


Defines the chemical analysis (Unified Numbering System) as a joint responsibility of the SAE and ASTM.

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